A $10 vial and a $50 vial tell us almost nothing until the labeled amount is beside the price. Lane, kit size, stock date, and shipping can change the comparison again.
The retatrutide page makes this especially clear by separating market layers and normalizing price per milligram. I think every price post should put the observation date and labeled amount in the first two lines. Anything else people need before two offers are genuinely comparable?